No. fil 407. 



Moving Coil Mirror Galvanometers. 



889 



61 406. 1 : 5. 



61 407. 1 : 6. 



61,404. Mirror Galvanometer after Ayrton-Mather Type No. 61,398, with three interchangeable 

 coils, 1 aperiodic coil of 30 ohms; one 325 ohm coil, aperiodic; one 1000 ohm coil, ballistic; 

 in mahogany carrying case 



The Ayrton-Mather Type Galvanometers are, unless otherwise stated, arranged for objective 

 reading and 2 metres scale distance, which permits of reading by a telescope at about 3.5 in distance. 

 They can also if necessary be provided with a plane mirror for telescope reading at any distance. 



61,40F>. Galvanometer after Ayrton-Mather Type No. 61,398, with arrangement for reading 

 by lamp and scale for zero methods, Figure, for fixing to the wall. In spite of the 

 small scale distance and small amount of space necessary, the sensitivity is increased 

 by interpolating a cylindrical mirror 



Unless otherwise staled, the singl" filament glow lamp pertaining to the instrument is supplied 

 for 110 volts 



s. d. 

 9. 0. 



8. 0. 



61.406. Laboratory Galvanometer after Ayrton, with moving coil, Figure, for fixing to 

 wall. The instrument is always ready for use and takes up but little room. With 



600 ohms resistance 1" deflection = approx. 3xlO~ N amp \ 9. 0. 



61.407. Moving Coil Mirror Galvanometer for fixing to wall, Figure, very simple and 

 practical type; sensitivity: 1 mm at 1 in scale distance and 300 ohms resistance = 

 approx. 6xlo- !P amp 5. 0. 



Cl. 2383, 5385, 5329, 

 2334, 5078. 



